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Related Experiment Videos

Reinitiation at the lambda DNA origin accompanies the host SOS response.

M Schnös, R B Inman

    Virology
    |June 1, 1987
    PubMed
    Summary
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    The SOS response, triggered by DNA damage, causes abnormal replication reinitiation in lambda origins. This occurs because the SOS response relaxes the superhelical tension requirement for replication initiation.

    Area of Science:

    • Molecular Biology
    • Virology
    • Genetics

    Background:

    • Abnormal replication reinitiation from lambda origins is observed under specific conditions, including caffeine, cis-diamminedichloroplatinum II (cis-Pt) treatment, or P2 lysogen infection.
    • Previous studies linked cis-Pt-induced reinitiations to the SOS response triggered by DNA damage.

    Purpose of the Study:

    • To investigate whether SOS induction by ultraviolet (uv) irradiation also leads to replication reinitiation events.
    • To determine if the SOS response itself, rather than direct template damage, is responsible for replication reinitiation.

    Main Methods:

    • Induction of the SOS response in host cells via uv irradiation.
    • Analysis of lambda replication intermediates to observe reinitiation events.
    • Comparison of reinitiation under different SOS-inducing conditions.

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    Main Results:

    • SOS induction by uv irradiation results in abnormal reinitiation of replication from lambda origins.
    • The SOS response, not other direct template effects, is the cause of these reinitiation events.
    • In an SOS environment, the requirement for superhelical tension in origin sequences is relaxed, leading to loss of control against reinitiation.

    Conclusions:

    • The SOS response is a key factor in controlling replication reinitiation from lambda origins.
    • Relaxation of superhelical tension requirements during the SOS response allows for new replication initiation events, even at sites of template lesions.